If I have the public key and signature for a transaction how do I get the hash value that is used in verify(hash, sig, pubkey). I want to know how to work backwards from a raw transaction to get it, ...

I understand that a bitcoin address is a combination or more than one kind of encryption and entropy, and I also understand how improbable it is that the same address will get generated at the same ...

I'm using: https://github.com/bitcoin-abe/bitcoin-abe to import the blockchain into a mysql DB it is almost done after 5 days. So I started looking at the data and didn't see any addresses. I know the ...

The following link contains details on how to reverse the ECDSA signature if given two identical "R" values.
http://www.nilsschneider.net/2013/01/28/recovering-bitcoin-private-keys.html
I have read ...

to create the block chain, the Bitcoin network runs hashing algorithms for each block, is it mathematically possible to predict the hash value of say, the 100th block from the last block currently in ...

The first figure in the original paper of Satoshi is a diagram of transactions. This diagram seems to indicate that the transaction data is hashed before the sender's signature is appended. Why not ...

Can anyone please tell me, which variable holds the hash of the solution of block's PoW in broadcasted block?
I know that a block consists of (I am pretty sure I am forgetting some variables here):
...

For example, in the Genesis block in Bitcoin, from which values was the solution hash "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f" derived from? I understand that the nonce is ...

Would it be possible to hamper the network's efforts in validating blocks by creating millions and millions of bogus transactions- simply sending back and forth say 0.1 BTC from address A --> B --> C ...

...or is each client responsible for storing hashes for blocks and transactions in their own database? So when I send a transaction, I indicate the prev_out by its hash, and I just assume everyone on ...

I have an i3-3220 processor which i am using for mining.
I know that you're supposed to use a GPU and all that. But currently i'm just trying it out before spending money.
I'm using CPUMiner, mining ...

What is a "share rate" one can find in a mining pool dashboard?
I understand what a hash-rate is, and how that applies to myself (miner), as well as to the pool or the network. I also understand to ...

I just tried to use unowallet.
It seem that the private key is somehow encoded into the url.
Isn't it some known type of representation?
Wouldn't it be possible to create an url for my private key?
...

According to https://en.bitcoin.it/wiki/Target the target is a 256-bit number.
As the total hash-rate of the Bitcoin network rises, this number decreases to increase the difficulty. How much hash-rate ...

I read that if sha-256 was compromised at some point in the future, or for any other reason, bitcoin could switch to a different algorithm
can someone detail how exactly that would work, and what the ...

I found out this address playing with blockchain
https://blockchain.info/address/3NukJ6fYZJ5Kk8bPjycAnruZkE5Q7UW7i8
I found out it's something called "scripthash". How does it work exactly? How does ...

Many online Bitcoin gambling websites use the block chain info to prove fairness. Most of them use rather complex algorithms for this with pre-published secrets.
What most of them basically achieve: ...

According to the wiki specification of the bitcoin protocol, hashes are typically "computed twice". For example:
hello
2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824 (first round of ...